TRENTON — The summer lull for the state legislative committee investigating the George Washington Bridge lane closures is expected to continue through the end of the month, according to one of the lawmakers leading the panel.

State Assemblyman John Wisniewski (D-Middlesex) said today the Democratic-controlled committee isn’t expected to subpoena additional witnesses until at least September to testify before lawmakers.

The committee’s investigation into the lane closures and Gov. Chris Christie’s administration has slowed in recent weeks because of a dueling federal investigation and also lawmakers’ summer schedules. Committee members are slated to take part in a conference call by the end of this week to discuss any updates into the probe.

“I can’t imagine that in the first week of August that there are going to be any subpoenas issued in the next week or two because that would mean a late August committee hearing,” Wisniewski said.

And with lawmakers “trying to get their last crack of summer,” it’s more likely if any additional witnesses are called, that it would be in September at the earliest, he said.

Last month, panel members indicated a new round of subpoenas for testimony – which included possibly calling on members of Christie’s administration and inner circle to answer questions under oath – was imminent. However, additional public testimony was put on ice largely to avoid tripping up the U.S. Attorney’s office investigation.

The committee could potentially be given the clear to interview additional people when they are briefed by counsel later this week, said Sen. Loretta Weinberg (D-Bergen), the committee’s co-chair.

“We check often with the U.S. attorney,” she said. “Somebody we can’t interview this week we may be able to interview next week.”

Additional public testimony will still likely be put on hold until September.

However, lawmakers say the slow pace into the investigation shouldn’t signal the inquiry is altogether fading.

“We don’t have answers to all the questions we need to have answers to,” Wisniewski said. “Until we do, it’s premature to say that we’re done and it’s premature to say that we’re moving on to other things – sometimes there are lulls.”